I think hd_worldcup is the first fest to give the readers entitlement issues. Yes, this is the one fest where you can say pretty much anything in a comment and NOT have people jump on you if you're being less than squeefull or considerate.
For once on LJ, rather than being pressured into leaving the generic "Me like" comments, we can give constructive feedback because it's a *competition* and fics are there to be judged.
But going as far as pointing out SPAG in a fic when other fics are no exceptions? Seems incredibly petty. But no, errors are errors and yeah you can say what you like. That doesn't stop you from being an asshat.
What I don't get is that if you don't like a fic - your vote will show it. You don't really need to list all the ways a fic failed to work for you because not only will that not be counted in votes but it could also influence the votes other people make or worse, influence them not to read a fic.
If you are really dissatisfied with a fic, blog about it in your own lj or better yet, wait until the end of the fest and comment so the writer can respond and doesn't end up stewing over it for over a month. Sure they can respond anon but not everyone believes in that.
And as much as you'd like to forget about it, the authors ARE individuals and if you start ripping their work apart they'll remember it - especially if you have no tact or consideration. That way, even if they're sort of expected to lie back and take it, they're still going to have a part of their mind where they're beating you to pulp.